The Fender TB-600C Combo provides thick, natural and balanced tone that sits perfectly in the mix onstage and in the studio. Based on the critically acclaimed TBP-1 tube bass pre-amp, the key to its powerful tone is its passive tone stack, which is the backbone of classic Fender guitar and bass amps. In a passive tone stack, the working of each knob affects the others, resulting in big, warm notes. The Fender TB-600C combo delivers 400 watts to its internal 8-ohm load; 600 watts when paired with any 8-ohm external cabinet.